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if so, you can add this rule to web.config:
<rules>
<rule name="Convert to lower case" stopProcessing="false">
<match url=".*[A-Z].*" ignoreCase="false"/>
<conditions>
<!-- The following condition prevents rule from rewriting requests to .axd files -->
<add input="{URL}" negate="true" pattern="\.axd$"/>
</conditions>
<action type="Redirect" url="{ToLower:{R:0}}" redirectType="Permanent"/>
</rule>